If you’re a corneal transplant recipient who gets flu shots, you may want to ask your corneal surgeon if you should use Tobradex (or equivalent) to avoid potential rejection due to the flu vaccine. My particular instructions involve taking some drops a few day before my flu shot, and then for several times per day for a month afterward. My doctor also recommended that I continue with Restasis as it provides some measure of rejection prevention.

This is done in an abundance of caution, I think. But it’s worth a quick call to see if it might reduce your own chances for rejection.